#ifndef _MD5_H
#define _MD5_H

//#pragma warning(disable:4786)

#include <string>

using namespace std;

/*!
 * Manage MD5.
 */
class CMD5
{
private:
 #define uint8  unsigned char
 #define uint32 unsigned long int

 struct md5_context
 {
  uint32 total[2];
  uint32 state[4];
  uint8 buffer[64];
 };

 void md5_starts( struct md5_context *ctx );
 void md5_process( struct md5_context *ctx, uint8 data[64] );
 void md5_update( struct md5_context *ctx, uint8 *input, uint32 length );
 void md5_finish( struct md5_context *ctx, uint8 digest[16] );

public:
 //! construct a CMD5 from any buffer
 void GenerateMD5(unsigned char* buffer,int bufferlen);

 //! construct a CMD5
 CMD5();

 //! construct a md5src from char *
 CMD5(const char * md5src);

 //! construct a CMD5 from a 16 bytes md5
 CMD5(unsigned long* md5src);

 //! add a other md5
 CMD5 operator +(CMD5 adder);

 //! just if equal
 bool operator ==(CMD5 cmper);

 //! give the value from equer
 // void operator =(CMD5 equer);

 //! to a string
 string ToString();

 unsigned long m_data[4];
};
#endif /* md5.h */
 

Md5.cpp

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/*  
 * RFC 1321 compliant MD5 implementation,  
 * by Christophe Devine <devine@cr0.net>;  
 * this program is licensed under the GPL.  
 */  
#include "Md5.h"   
#include <stdio.h>   
#include <stdlib.h>   
#include <string.h>   
  
#define GET_UINT32(n,b,i)                                       \   
{                                                               \   
    (n) = (uint32) ((uint8 *) b)[(i)]                           \   
      | (((uint32) ((uint8 *) b)[(i)+1]) <<  8)                 \   
      | (((uint32) ((uint8 *) b)[(i)+2]) << 16)                 \   
      | (((uint32) ((uint8 *) b)[(i)+3]) << 24);                \   
}   
  
#define PUT_UINT32(n,b,i)                                       \   
{                                                               \   
    (((uint8 *) b)[(i)]  ) = (uint8) (((n)      ) & 0xFF);      \   
    (((uint8 *) b)[(i)+1]) = (uint8) (((n) >>  8) & 0xFF);      \   
    (((uint8 *) b)[(i)+2]) = (uint8) (((n) >> 16) & 0xFF);      \   
    (((uint8 *) b)[(i)+3]) = (uint8) (((n) >> 24) & 0xFF);      \   
}   
  
//extern pthread_mutex_t mutexMemory;   
  
void CMD5::md5_starts( struct md5_context *ctx )   
{   
    ctx->total[0] = 0;   
    ctx->total[1] = 0;   
    ctx->state[0] = 0x67452301;   
    ctx->state[1] = 0xEFCDAB89;   
    ctx->state[2] = 0x98BADCFE;   
    ctx->state[3] = 0x10325476;   
}   
  
void CMD5::md5_process( struct md5_context *ctx, uint8 data[64] )   
{   
    uint32 A, B, C, D, X[16];   
  
    GET_UINT32( X[0],  data,  0 );   
    GET_UINT32( X[1],  data,  4 );   
    GET_UINT32( X[2],  data,  8 );   
    GET_UINT32( X[3],  data, 12 );   
    GET_UINT32( X[4],  data, 16 );   
    GET_UINT32( X[5],  data, 20 );   
    GET_UINT32( X[6],  data, 24 );   
    GET_UINT32( X[7],  data, 28 );   
    GET_UINT32( X[8],  data, 32 );   
    GET_UINT32( X[9],  data, 36 );   
    GET_UINT32( X[10], data, 40 );   
    GET_UINT32( X[11], data, 44 );   
    GET_UINT32( X[12], data, 48 );   
    GET_UINT32( X[13], data, 52 );   
    GET_UINT32( X[14], data, 56 );   
    GET_UINT32( X[15], data, 60 );   
  
#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))   
  
#define P(a,b,c,d,k,s,t)                                \   
{                                                       \   
    a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \   
}   
  
    A = ctx->state[0];   
    B = ctx->state[1];   
    C = ctx->state[2];   
    D = ctx->state[3];   
  
#define F(x,y,z) (z ^ (x & (y ^ z)))   
  
    P( A, B, C, D,  0,  7, 0xD76AA478 );   
    P( D, A, B, C,  1, 12, 0xE8C7B756 );   
    P( C, D, A, B,  2, 17, 0x242070DB );   
    P( B, C, D, A,  3, 22, 0xC1BDCEEE );   
    P( A, B, C, D,  4,  7, 0xF57C0FAF );   
    P( D, A, B, C,  5, 12, 0x4787C62A );   
    P( C, D, A, B,  6, 17, 0xA8304613 );   
    P( B, C, D, A,  7, 22, 0xFD469501 );   
    P( A, B, C, D,  8,  7, 0x698098D8 );   
    P( D, A, B, C,  9, 12, 0x8B44F7AF );   
    P( C, D, A, B, 10, 17, 0xFFFF5BB1 );   
    P( B, C, D, A, 11, 22, 0x895CD7BE );   
    P( A, B, C, D, 12,  7, 0x6B901122 );   
    P( D, A, B, C, 13, 12, 0xFD987193 );   
    P( C, D, A, B, 14, 17, 0xA679438E );   
    P( B, C, D, A, 15, 22, 0x49B40821 );   
  
#undef F   
  
#define F(x,y,z) (y ^ (z & (x ^ y)))   
  
    P( A, B, C, D,  1,  5, 0xF61E2562 );   
    P( D, A, B, C,  6,  9, 0xC040B340 );   
    P( C, D, A, B, 11, 14, 0x265E5A51 );   
    P( B, C, D, A,  0, 20, 0xE9B6C7AA );   
    P( A, B, C, D,  5,  5, 0xD62F105D );   
    P( D, A, B, C, 10,  9, 0x02441453 );   
    P( C, D, A, B, 15, 14, 0xD8A1E681 );   
    P( B, C, D, A,  4, 20, 0xE7D3FBC8 );   
    P( A, B, C, D,  9,  5, 0x21E1CDE6 );   
    P( D, A, B, C, 14,  9, 0xC33707D6 );   
    P( C, D, A, B,  3, 14, 0xF4D50D87 );   
    P( B, C, D, A,  8, 20, 0x455A14ED );   
    P( A, B, C, D, 13,  5, 0xA9E3E905 );   
    P( D, A, B, C,  2,  9, 0xFCEFA3F8 );   
    P( C, D, A, B,  7, 14, 0x676F02D9 );   
    P( B, C, D, A, 12, 20, 0x8D2A4C8A );   
  
#undef F   
       
#define F(x,y,z) (x ^ y ^ z)   
  
    P( A, B, C, D,  5,  4, 0xFFFA3942 );   
    P( D, A, B, C,  8, 11, 0x8771F681 );   
    P( C, D, A, B, 11, 16, 0x6D9D6122 );   
    P( B, C, D, A, 14, 23, 0xFDE5380C );   
    P( A, B, C, D,  1,  4, 0xA4BEEA44 );   
    P( D, A, B, C,  4, 11, 0x4BDECFA9 );   
    P( C, D, A, B,  7, 16, 0xF6BB4B60 );   
    P( B, C, D, A, 10, 23, 0xBEBFBC70 );   
    P( A, B, C, D, 13,  4, 0x289B7EC6 );   
    P( D, A, B, C,  0, 11, 0xEAA127FA );   
    P( C, D, A, B,  3, 16, 0xD4EF3085 );   
    P( B, C, D, A,  6, 23, 0x04881D05 );   
    P( A, B, C, D,  9,  4, 0xD9D4D039 );   
    P( D, A, B, C, 12, 11, 0xE6DB99E5 );   
    P( C, D, A, B, 15, 16, 0x1FA27CF8 );   
    P( B, C, D, A,  2, 23, 0xC4AC5665 );   
  
#undef F   
  
#define F(x,y,z) (y ^ (x | ~z))   
  
    P( A, B, C, D,  0,  6, 0xF4292244 );   
    P( D, A, B, C,  7, 10, 0x432AFF97 );   
    P( C, D, A, B, 14, 15, 0xAB9423A7 );   
    P( B, C, D, A,  5, 21, 0xFC93A039 );   
    P( A, B, C, D, 12,  6, 0x655B59C3 );   
    P( D, A, B, C,  3, 10, 0x8F0CCC92 );   
    P( C, D, A, B, 10, 15, 0xFFEFF47D );   
    P( B, C, D, A,  1, 21, 0x85845DD1 );   
    P( A, B, C, D,  8,  6, 0x6FA87E4F );   
    P( D, A, B, C, 15, 10, 0xFE2CE6E0 );   
    P( C, D, A, B,  6, 15, 0xA3014314 );   
    P( B, C, D, A, 13, 21, 0x4E0811A1 );   
    P( A, B, C, D,  4,  6, 0xF7537E82 );   
    P( D, A, B, C, 11, 10, 0xBD3AF235 );   
    P( C, D, A, B,  2, 15, 0x2AD7D2BB );   
    P( B, C, D, A,  9, 21, 0xEB86D391 );   
  
#undef F   
  
    ctx->state[0] += A;   
    ctx->state[1] += B;   
    ctx->state[2] += C;   
    ctx->state[3] += D;   
}   
  
void CMD5::md5_update( struct md5_context *ctx, uint8 *input, uint32 length )   
{   
    uint32 left, fill;   
  
    if( ! length ) return;   
  
    left = ( ctx->total[0] >> 3 ) & 0x3F;   
    fill = 64 - left;   
  
    ctx->total[0] += length <<  3;   
    ctx->total[1] += length >> 29;   
  
    ctx->total[0] &= 0xFFFFFFFF;   
    ctx->total[1] += ctx->total[0] < length << 3;   
  
    if( left && length >= fill )   
    {   
        memcpy( (void *) (ctx->buffer + left), (void *) input, fill );   
        md5_process( ctx, ctx->buffer );   
        length -= fill;   
        input  += fill;   
        left = 0;   
    }   
  
    while( length >= 64 )   
    {   
        md5_process( ctx, input );   
        length -= 64;   
        input  += 64;   
    }   
  
    if( length )   
    {   
        memcpy( (void *) (ctx->buffer + left), (void *) input, length );   
    }   
}   
  
static uint8 md5_padding[64] =   
{   
 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0   
};   
  
void CMD5::md5_finish( struct md5_context *ctx, uint8 digest[16] )   
{   
    uint32 last, padn;   
    uint8 msglen[8];   
  
    PUT_UINT32( ctx->total[0], msglen, 0 );   
    PUT_UINT32( ctx->total[1], msglen, 4 );   
  
    last = ( ctx->total[0] >> 3 ) & 0x3F;   
    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );   
  
    md5_update( ctx, md5_padding, padn );   
    md5_update( ctx, msglen, 8 );   
  
    PUT_UINT32( ctx->state[0], digest,  0 );   
    PUT_UINT32( ctx->state[1], digest,  4 );   
    PUT_UINT32( ctx->state[2], digest,  8 );   
    PUT_UINT32( ctx->state[3], digest, 12 );   
}   
  
void CMD5::GenerateMD5(unsigned char* buffer,int bufferlen)   
{   
    struct md5_context context;   
    md5_starts (&context);   
    md5_update (&context, buffer, bufferlen);   
    md5_finish (&context,(unsigned char*)m_data);   
}   
  
CMD5::CMD5()   
{   
    for(int i=0;i<4;i++)   
        m_data[i]=0;   
}   
  
CMD5::CMD5(unsigned long* md5src)   
{   
    memcpy(m_data,md5src,16);   
}   
int _httoi(const char *value)   
{   
  struct CHexMap   
  {   
    char chr;   
    int value;   
  };   
  const int HexMapL = 16;   
  CHexMap HexMap[HexMapL] =   
  {   
    {'0', 0}, {'1', 1},   
    {'2', 2}, {'3', 3},   
    {'4', 4}, {'5', 5},   
    {'6', 6}, {'7', 7},   
    {'8', 8}, {'9', 9},   
    {'a', 10}, {'b', 11},   
    {'c', 12}, {'d', 13},   
    {'e', 14}, {'f', 15}   
  };   
  //pthread_mutex_lock(&mutexMemory);   
  char *mstr = strdup(value);   
  //pthread_mutex_unlock(&mutexMemory);   
  char *s = mstr;   
  int result = 0;   
  if (*s == '0' && *(s + 1) == 'X') s += 2;   
  bool firsttime = true;   
  while (*s != '\0')   
  {   
    bool found = false;   
    for (int i = 0; i < HexMapL; i++)   
    {   
      if (*s == HexMap[i].chr)   
      {   
        if (!firsttime) result <<= 4;   
        result |= HexMap[i].value;   
        found = true;   
        break;   
      }   
    }   
    if (!found) break;   
    s++;   
    firsttime = false;   
  }   
  //pthread_mutex_lock(&mutexMemory);   
  free(mstr);   
  //pthread_mutex_unlock(&mutexMemory);   
  return result;   
}   
  
  
CMD5::CMD5(const char* md5src)   
{   
    if (strcmp(md5src,"")==0)   
    {   
        for(int i=0;i<4;i++)   
            m_data[i]=0;   
        return;   
    }   
    for(int j = 0; j < 16; j++ )   
    {   
        char buf[10];   
        strncpy(buf,md5src,2);   
        md5src+=2;   
        ((unsigned char*)m_data)[j] = _httoi(buf);   
    }   
}   
  
CMD5 CMD5::operator +(CMD5 adder)   
{   
    unsigned long m_newdata[4];   
    for(int i=0;i<4;i++)   
        m_newdata[i]=m_data[i]^(adder.m_data[i]);   
    return CMD5(m_newdata);   
}   
  
bool CMD5::operator ==(CMD5 cmper)   
{   
    return (memcmp(cmper.m_data ,m_data,16)==0);   
}   
  
//void CMD5::operator =(CMD5 equer)   
//{   
//  memcpy(m_data,equer.m_data ,16);   
//}   
  
string CMD5::ToString()   
{   
    char output[33];   
    for(int j = 0; j < 16; j++ )   
    {   
        sprintf( output + j * 2, "%02x", ((unsigned char*)m_data)[j]);   
    }   
    return string(output);   
} 